<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"/>
    <title></title>
    <style>
        * {
            margin: 0;
            padding: 0;
            font-size: 62.5%;
        }
        div{
            width: 1rem;
            height: 1rem;
            background-color:pink;
        }
    </style>


</head>
<body>
    <div></div>
</body>
</html>